What is the measure of each interior angle of a regular octagon?
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Correct answer to question 184 (Mathematics Knowledge): 135
Method
An octagon has 8 sides, so its interior angles sum to (8 - 2) x 180 = 1080 degrees. A regular octagon splits this equally among its 8 angles, giving 1080 / 8 = 135.
Updated: November 2026
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